Bumping gaia.json for 2 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-central/rev/0b4b8404a7ee
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Merge pull request #19683 from etiennesegonzac/bug-1011071-wrong-resize

Bug 1011071 - Don't make the LayoutManager lie and special case the lockscreen resize r=alive

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https://hg.mozilla.org/integration/gaia-central/rev/54b516bb0e32
Author: Etienne Segonzac <etienne@segonzac.info>
Desc: Bug 1011071 - Don't make the LayoutManager lie and special case the lockscreen resize

b2g/config/gaia.json

@@ -4,6 +4,6 @@
         "remote": "", 
         "branch": ""
     }, 
-    "revision": "0cf068c232d90768640d561f83dcb789bb6cf94a", 
+    "revision": "0b4b8404a7ee9a67e71714c4895e48a9780527b4", 
     "repo_path": "/integration/gaia-central"
 }